Ball-bearing for disk drills.



No. 774,146. PATENTED NOV. 8, 1904.

0. s. BAKKE. BALL BEARING FOR DISK DRILLS.

' APPLICATION FILED MAR. 25,1904. N0 MOD-EL.

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Patented November 8, 1904.

PATENT OFFICE.

OSCAR S. BAKKE, OF MINNEAPOLIS, MINNESOTA.

BALL-BEARING FOR DISK DRILLS.

SPECIFICATION forming part of Letters Patent No. 774,146, dated November8, 1904,

Application filed March 25, 1904. Serial No- 199,894=. (No model.)

To all whom it may concern.-

Be it known that I, OSCAR S. BAKKE, a citizen of the United States,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements inBall-Bearings for Disk Drills; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

The invention has for its object to provide an improved ball-bearingjournal for disk drills; and to this end it consists of the noveldevices and combinations of devices hereinafter described, and definedin the claims.

The invention is illustrated in the accompanying drawings, wherein likecharacters indicatelike parts throughout the several views.

Figure 1 is a View in side elevation, with some parts broken away,showing the disks and boot of a disk drill, said parts being connectedin accordance with my invention. Fig. 2 is an enlarged sectional viewtaken approximately on a horizontal line passing through the center ofFig. 1, and Fig. 3 is a detail in section on the line 00 m of Fig. 2.

The numeral 1 indicates the seed-boot, andthe numeral 2 the disks, whichdisks are 'secured to annular hubs 3 by rivets or in any other suitableway. At the sides of its lower extremity the seed-boot 1 is formed withlaterally-projecting bosses 4:, which fit in recesses formed in theinner faces of the hubs 3. The hubs 3 when fitted onto the bosses 4 bearagainst the sides of the boot with their axes intersecting at an angle,so that the disks diverge rearward, as is usual in disk-drills. Forwardof its seed-passage 5 the boot 1 is formed with a vertical recess 6. Thewalls on the opposite sides of the recess 6 are slotted at 7, so as toleave vertical clamping-ribs 8. The recess 6 and slots 7 are opened attheir lower extremities.

Threaded trunnions 9 project outward through the slot 7, with theirheads 10 located within the recess 6. The said bolts of course extend atan angle to each other and at right angles to the bearing-faces of thecorrespond ing hubs 3. Hardened bearing-nuts. 11 and 12 work withscrew-threaded engagement on the trunnions 9. The nuts 11 are tightened,so as to clamp the heads 10 of the bolts firmly against the interposedribs 8 of the seed-boot. thereby rigidly securing the trunnions 9. Bothof the nuts 11 and 12 are beveled, so that they afiord cone-bearings forthe bearing-balls 13. Nuts M work on the outer end of the trunnions 9,and washers 15 are preferably interposed between the said nuts 14 andthe cooperating nuts or bearings 12. The

nuts 14L when tightened lock the bearings 12 against rotation.

The hubs 3 are formed with recesses that open at their outer faces andin which are seated cooperating pairs of hardened ballrunways 16 and 17The said ball-runways are of course annular in contour, and incross-section they are rectangular. The inner members 16 are wider thanthe outer members 17, so that the balls 13 will engage the peripheralflanges of the former, but not of the latter. Cap-nuts 18 are screwedinto the recesses of the hubs 3 and press the annular ball-runways 17.

With the construction described it is evident that the trunnions 9 whenloosened up may be removed from working position by dropping themlaterally downward through the slots 7, and it is of course evident thatthey may be placed in working positions by reverse movements. It is alsoevident that the annular ball-runways and the bearing-cones if worn orbroken, may be readily replaced. It is further obvious that theball-bearing devices will mount the disks to run under a minimum offriction and at the same time that such ball bearing devices arerelieved from intense strains by the engagement of the bosses t with thecorrespondingly-formed re- .cesses of the hubs 3. Furthermore, thedevice is or simple construction and of small cost.

What claim, and desire to secure by Letters Patent of the United States,is as follows: 1. The combination with a seed-boot, of threadedtrunnions having heads seated within a recess of said boot andprojecting therefrom at an angle to each other, of bearingcones on saidtrunnions, one in each pair serving as a nut to clamp the cooperatingtrunnion-head to said boot, disks, havinghubs provided Withball-runways, bearing-balls cooperating With said ball-runways and.conebearings, and means for holding the said disks in operativepositions on the said trunnions, substantially as described.

2. The combination With a seed-boot having the recess 6, the slot 7 andvertical ribs 8, of a trunnion 9 having a head seated in said recess 6,said trunnion projecting through said slot 7, a cone-bearing 11screW-threaded on said trunnion and cooperating With said head 10 toclamp said ribs 8, an outer cone-bearing 12 on said trunnion, a nut onthe outer end of said trunnion for locking said bearing 12, a diskhaving a hub 3 recessed, and provided in. said recess With theball-runways 16 and 17, the bearing-balls 13 cooperating with saidcone-bearings 11 and 12 and runways l6 and 17 and the cap-nut 18 screwedinto the recess of said hub 3 and pressing against said ball-run- Ways17, substantially as described.

3. The combination With a seed-boot 1 having a laterally-projecting boss4:, a vertical recess 6, vertical slot 7 and vertical ribs 8, of a diskhaving a hub 3 bearing against the face of said boot 1 and recessed toreceive said boss 4, a threaded trunnion 9 projecting through said slot7 and having a head 10 Within said recess 6, the bearing-cones 11 and 12on said trunnion 9, the former cooperating with said head 10 to clampsaid ribs 8, bearing-balls cooperating With said cones and Withball-runways carried by said hub 3, and means for holding said hub inWorking position, substantially as described.

In testimony whereof I afiix my signature in presence of tWo Witnesses.

OSCAR S. BAKKE.

Witnesses:

JOHN J. MARTIN, J. A. DAHL.

